10011211221 has 16 divisors (see below), whose sum is σ = 14779104768. Its totient is φ = 5976841200.

The previous prime is 10011211193. The next prime is 10011211241. The reversal of 10011211221 is 12211211001.

It is not a de Polignac number, because 10011211221 - 2⁹ = 10011210709 is a prime.

It is a super-2 number, since 2×10011211221² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 10011211197 and 10011211206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10011211241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2261745 + ... + 2266166.

It is an arithmetic number, because the mean of its divisors is an integer number (923694048).

Almost surely, 2^10011211221 is an apocalyptic number.

10011211221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10011211221 is a deficient number, since it is larger than the sum of its proper divisors (4767893547).

10011211221 is a wasteful number, since it uses less digits than its factorization.

10011211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4527992.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 10011211221 its reverse (12211211001), we get a palindrome (22222422222).

The spelling of 10011211221 in words is "ten billion, eleven million, two hundred eleven thousand, two hundred twenty-one".